Bolt puller



0d. 26, 1948. w GRAY ETAL 2,452,457

. BOLT FULLER Filed Sept. 18, 1945 2 Sheets-Sheet 1 Oct. 26, 1948.

G. w. GRAY EI'AL BOLT FULLER 2 Sheets-Sheet 2 Filed Sept. 18, 1945 Patented Oct. 26, 1948 U-NPIT E'B sr res are. r

BOLT FULLER "Griifin W. Gray andUharles B. Wade, 'tRoanoke, Va.

:Application September 18, 1945, Serial N0.26175103 3"Claims. (e1. 254 :1's

'1 This invention relates. to-a screw; pulling device. ."An object .of this :invention is to provide a Jpullingdevice which .islde'signed especiallyfor fpulling lag screws from railroad ties. At the -.;ipne'sent timezthet la'gscrews, after being in use for a. period of time, becomefrozenin the tie randicannot :be: pulled therefrom sothat the lag the me without injury tothe screw.

Another obiect'of' this-invention isto provide 'a ipuller which includes "a housing enclosing an felon'g'ated"toothed'rackbarand 'a rock lever 'cartryinga'pawl'which is'engageable withthe rack so that rocking of the lever .will'move the "rack "endwise or upwardlyand simultaneously'pull' the screw from the-tie.

'A.'f.urther object vofthis invention is to provide a pfiller ofthetie Which includes an improved chuck and maymota-terelativeto the rack bar so that the screw may unthread from the tie as it is being pulled.

With the foregoing objectsin view; and others which niay'hereinafterfinore 'fullyrappear the invention consists of the noveleconstruction, combinaticnand arrangement 6f parts, aswill be companying drawings, wherein are shown-emibodiinentsof theinventio'n, but itis to be understood that changes, variations and modifications may be resorted to which fall Within the scope of the invention as claimed.

In the drawings:

Figure 1 is a detailed front elevation broken away and a view of a puller constructed according to an embodiment of this invention;

Figure 2 is a vertical section taken substantially on the line 2-2 of Figure 1;

Figure 3 is a sectional view taken on the line 3-3 of Figures 1 or 2;

Figure 4 is a sectional view taken on the line 44 of Figure 1;

Figure 5 is an end elevation of the bolt head socket embodied with this holder.

Referring now to the drawings, the numeral It designates generally an elongated housing which is formed with an elongated cylindrical body H oreispecifically described, and illustrated in the .12 havinga lever-housing 12 extending from the upper end thereof.

'Ihehousings I [and I2 have 'slidably mounted therein anelongatedrack bar l3 formediwith teeth M on .oneside thereof. Theflbar t3 has securedto its lowerend .a socketmember 15 formed with an internally.threaded-socket l6 and the member leis formed with .an annular rib I-1 whichslidably engages the inner surface of the housing member I I.

The. socket member 5.5 ;is .offsetfrom the. rack member l3a sufficient :degree to provide forthe slidable engagement of the opposite outer edges of .-the bar l3 with the housing 5 I. .A- bolt head socket member or chuck H3 is detachably mounted in the threaded socketi6 and extends downwardly from the socket member I5. -The chuck :l-8includes acyl-indrical. body 19 which is formed with alengthwise extending slot -21 which communicateswith-a larger slot 22 therebyforming a substantial ET-S-hfilid slot by means of which a flanged bolt 7 head member 23 may be engaged with the chuck member is. -The chuck member l8 includes an innerawall 24 which-has extending -upward1ytherefrom-a "threaded stud 25 which is threaded into the socket [6.

The rack member L3 is moved lengthwise into housingsA-i and i2 andin operative position is moved upwardly'iby'means'ofa double toothed dog or:pa-W1 2 6. The pawl "25 is rockablycarried by a rock-lever"?! :which is pivotally mounted as ii/1142 8 between the side vwalls 29 of the lever housing t2. The leverif T15 formed with a trans versely disposed arcuate channelililwithin which the round inner end portionii3l 'of the pawl'i26 is adapted: to rcokab'ly: engage. In this manner the spawhZt is:insertedin'the:channel '30 from one end of the channel at, thereby eliminating use of a pintle or shaft for the pawl.

The pawl 26 has extending therefrom a pair of wings or ears 32 which engage on opposite sides of the rack bar It so as to thereby hold the pawl 26 against lateral movement. The pawl 26 also has extending from one side thereof a pin 33 with which one end of a spring 34 is engaged. The opposite end of the spring 34 is secured to an eye 35 or the like which is carried. by the side wall 36 of the lever housing t2.

The side walls 29 of the housing I;2 are formed with openings 31 so that the pawl 26 may be manually raised to released position with, respect to the rack bar l3, so that the rack bar may be freely moved downwardly. The rack bar i3 is limited in its downward movement by means of a stop washer or lug 38 which is secured by fastening means 39 to the upper end of the rack bar. A U-shaped or looped handle 40 is secured to the upper wall Ill of the housing 12 so that the de vice may be held in vertical position during the operation of the lever 21.

It will be understood that the chuck l8 may be designed for receiving a polygonal nut head in which case the opening 22, which is the larger opening or slot, will extend straight rearwardly for a substantial distance and the side walls of the opening will hold the nut head of the bolt against turning movement.

In the use and operation of this device, the chuck member 18 is engaged with the flanged head 23 of the bolt, the chuck being initially extended from the lower end of the cylindrical housing I. The housing I I is then lowered until the lower or open end thereof engages the upper side of the tie or tie plate, whereupon the rock lever 2! is vertically rocked, thereby raising the rack bar l3. Inasmuch as the bolt or lag screw 23 is formed with a spiral shank the pulling of the bolt or screw 23 will cause rotation thereof.

Where the head of the bolt or lag screw is round, this head may rotate freely in the chuck 18. However, where the bolt head 23 is formed as a nut and is held against rotation relative to thechuck la, the latter may rotate relative to the socket It, being partiallyunthreaded therefrom with the endwise movement of the rack. However, as the spiral threads on the lag screw are of such pitch as to form about 2 /2 complete turns for the length of the lag screw, the stud 25 may rotate for two complete turns in the socket 16 without withdrawing the stud 25 a sufficient degree to injure the threads of the stud or I the socket.

With a pulling device as hereinbefore described, the lag screws which were usually broken when withdrawn from the ties may be removed without danger to the lag screw and will eliminate the present practice of breaking the upper end of the lag screw and then driving the embedded portion of the screw through the tie.

When the screw is driven through the tie it is necessary to plug the old hole and then rebore the plug to receive the new lag screw. This procedure not only consumes time but also requires a new lag screw. With the puller as hereinbefore described and with a lag screw as embodied in our co-pending application the lag screw will unthread from the opening as it is withdrawn, leaving a clean threaded opening to receive the same lag screw.

What we claim is:

1. A puller comprising an elongated hollow member formed with a cylindrical housing and a pawl housing extending from said cylindrical housing, a socket member slidable in said cylindrical housing, a toothed rack fixed to said socket member in ofiset relation whereby one side of said rack will slidably engage both housings, a rock lever carried by said pawl housing, a pawl carried by said lever engaging said rack for moving said rack in one direction and a chuck carried by said socket, said socket being formed with interior threads, and an externally threaded stud carried by said chuck for detachably and rotatably coupling said chuck to said socket.

2. A puller comprising an elongated tubular housing, a toothed rack slidable in said housing, a rock lever carried by said housing, a pawl carried by said lever engaging said rack, said rack having a threaded socket in one end thereof, and a chuck threaded into said socket, said chuck including a round body rotatably engaging in said housing and having an opening in its outer end, said body also having an opening through one side thereof, and a threaded stud extending from the inner end of said body threadably and rotatably engaging in said socket, whereby said chuck may turn in said socket when a screw threaded article is being pulled.

3. A puller comprising an elongated tubular housing, a toothed rack slidable in said housing, a rock lever carried by said housing, said lever having a transverse groove in the inner end thereof, a pawl carried by said lever engaging said rack, said pawl including a rounded end rockably engaging in said'groove and insertable in said groove from one end thereof, said rack having a threaded socket in one end thereof, and a chuck threaded into said socket, said chuck including a round body rotatably engaging in said housing and having an opening in its outer end, said body also having an opening through one side thereof, and a threaded stud extending from the inner end of said body threadably and rotatably engaging in said socket whereby said chuck may turn in said socket when a screw threaded article is being pulled.

GRIFFIN W. GRAY. CHARLES E. WADE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 775,534 Hood Nov. 22, 1904 932,903 Reiley Aug. 31, 1909 971,915 Miller Oct. 4, 1910 2,330,874 Eaves Oct. 5, 1943 

